I have a 1999 300 RX. It has been a great car but I have some sort of problem where the battery and the alternator checking OK, I drive it where it started perfectly after stored overnight, get it to a store, go into the store for a half hour, come out and the battery is clicking. So, in that it started fine after overnight, I don't think mine is a parasitic drain any ideas? I'm desperate.🙏 This doesn't happen every time I just never know when it's going to happen.